Play this game ↗ · About this game · By alphaBETA DEV · Published 2026-10-12 · Updated 2026-10-26 · Editorial standards · Changelog

Last Online: Complete Walkthrough — 12 Puzzles, 5 Devices and Three Endings

Spoiler warning: This article gives the answers to all 12 puzzles, the four sets of accepted spellings, the eight unsent draft keywords and when you can type them, and the trigger conditions for all three endings. Most answers in this game have to be "counted out" or "compared out" of the data — understanding the derivation matters more than reading the answer. If you only want to keep your first playthrough intact, read just Sections 2 and 3 (system rules and the clock), and come back to look up a specific puzzle while you are working on it.

Where this guide comes from: Last Online is a game we made ourselves. Every number here, every spelling a puzzle accepts, and every clock advance in minutes were checked against the words shown on screen, one line at a time, and confirmed by playing the whole way through on the live build of 25 October 2026 (https://lastonline.gamestrategists.com/). The screenshots in this article are real gameplay.

1. What this game is

Your younger sister, Su Chi, has gone missing. The older sister, Su Wan, logs in to the old phone Su Chi left in the family sharing — a "family device management console". Everything you can do is what this console allows you to do: view the location trail, ring devices remotely to read their microphone levels, scroll the photo sync stream, listen to the voice assistant's wake logs, inspect the family account's administrator list, and that "Erase This Device" button anyone can press.

It contains no supernatural content and does not rely on jump scares. The horror comes from a very specific modern experience: your devices know where you were yesterday better than you do.

2. Six rules you must know before you start

1. The 12 puzzles are a single linear chain. Every puzzle opens only after the one before it: puzzle 2 needs puzzle 1, puzzle 3 needs puzzle 2 … puzzle 12 needs puzzle 11. There is no structure that lets you skip, run puzzles in parallel, or "do the later ones first and come back". So this walkthrough can be read linearly too.

2. Apps are mounted by act, not unlocked by clicking.

The left sidebar marks apps that are not mounted yet with 🔒 and their act number, so there is nothing to guess.

3. Acceptable spellings are looser than you think. The same matching engine as earlier games in the series: case is ignored, extra spaces and punctuation are ignored, and differences in the Chinese trailing particles de / le / guo (roughly "of", "have" and "ever") also count as correct. This article lists the full accept set for every puzzle.

4. Getting stuck will not lock you out. The same three-tier hint degradation: the first wrong attempt gives you a direction, the second something more specific, the third the answer in plain text. The hints you used show up on the results screen, and this game will not lock an ending because of it — but it will change your own verdict on "did I actually solve that myself".

5. The input box checks for drafts before it checks your answer. The console has exactly one input box, and it does two jobs: submitting answers, and surfacing the eight unsent drafts Su Chi left behind. When what you typed matches a draft you have not found yet, that submission is not an answer — the clock does not move, it is not counted as a miss, and no hint tier fires (measured: typing two keywords in a row took the counter from 0/8 to 2/8 while the top-bar clock did not move a minute). The flip side: typing a keyword whose draft is not unlocked yet is handled as a wrong answer. Typing six seconds in Act 1 — a draft that needs Act 4 — cost 9 minutes and pulled up the first hint tier for the puzzle on screen. Section 5 has the table of which act each of the eight words waits for.

6. The clock in the top-right corner really runs, and wrong answers push it faster. See the next section.

3. The in-game clock: starts at 22:41, advances with every answer

The 22:41 in the console's top bar is not decoration. It starts at 22:41 and advances on every answer submission — right or wrong:

Getting the first 11 puzzles right on the first try comes to 105 minutes, i.e. from 22:41 to 00:26; the final puzzle is itself a choice, so deciding costs another 7 minutes. A clean run with no wrong submissions therefore shows an elapsed time of 1 h 52 min on the end screen — measured in two runs, one that collected all eight drafts and took Ending C, one that collected nothing and took Ending A. Every wrong attempt adds another 7 to 14 minutes, so your time is a direct readout of how many times you were wrong — if you want a clean time, do not force your way through degraded hints. Surfacing a draft is not in the table above: it costs no minutes at all.

Also: each correct answer makes "Confirmed · HH:MM" in the top bar jump as well; that is your only feedback for judging "how much this step cost me".

4. All 12 puzzles, solved

Each puzzle below gives what to enter, what else you can enter, and which numbers the answer is derived from.

Puzzle 1 · Unlock this device (Act 0 · Device · text)

Reading the photo library and the assistant logs needs the device passcode. Six digits.

• Answer: 031209
• Also accepted: 03120 / 31209 / 20090312 / 03-12-09 (the English interface accepts the first four as well)
• Where it comes from: the first photo in the library has the filename IMG_0312.jpg and an EXIF time of 2009-03-12 16:40. Month and day first, then the last two digits of the year: 0312 + 09.
• After unlocking: that photo is from the day of the move, 12 March 2009: two girls standing in an empty room, with "404" written on the wall in pencil — the hole left behind after the door plate was taken down. This is the first hidden link between this game and Room 404.

Puzzle 2 · The gap in the trail (Act 1 · Find · text)

The trail disappears at the same moment every night: 02:11 → 02:47. Count how many nights there are.

• Answer: 11
• Also accepted: 十一 ("eleven") / 11 个 ("11 of them") / 11晚 ("11 nights") / 十一天 ("eleven days") / eleven / 11 nights
• Where it comes from: the trail table lists rows one by one from 2026-09-04 to 2026-09-14, each carrying a 02:11 → 02:47 gap — exactly 11 rows.
• Worth pausing on: 11 times, 36 minutes each, not a second out. A person does not start walking in the same minute and stop in the same minute every day. This is a scheduled time window.

Puzzle 3 · Which one is by the water (Act 1 · Find · choice)

Ring each offline device remotely, one by one, and read back the microphone level. Which device's echo comes from the waterside?

• Answer: Su Chi's watch
• The four options' levels: iPhone 13 → 63 dB (an occupied indoor room); wireless earbud (right) → no response, battery at 0 for 11 days; Su Wan's laptop → 27 dB, a short echo, the empty garage behind you; the watch → 41 dB, a steady wind, and water slapping against concrete, beat by beat.
• The lookup table is right there in the data: 3 dB a fully silent room / 27 dB an empty garage / 41 dB waterside / 63 dB an occupied indoor room. This puzzle is not a guess; it is a table lookup.
• Dossier addition: the old wharf. On 3 of the 11 nights (09-06, 09-10, 09-11) her watch stood there for 36 minutes. At the bottom of the same screen is a small line: MIC GAIN auto-adjusted · by supervisor permission — you never adjusted the gain.

Puzzle 4 · The door plate in the glass reflection (Act 2 · Photos · text)

IMG_2216 is focused on the street-facing glass. The glass reflects the door plate of a building across the street. Enter that door plate number.

• Answer: 7-14
• Also accepted: 714 / 7—14 / 七之十四 ("seven fourteen") / 7号14 ("No. 7, unit 14") / 7 14
• Where it comes from: zoom the photo into the top-right corner; a streetlight lights up two groups of digits, the first group a single digit, joined by a short dash. The full address is Building 7, Unit 14, Lansheng Road.
• Note: 714 is also correct. The plate is two groups joined by a dash; 0714 is not this puzzle's format.

Puzzle 5 · The impossible one (Act 2 · Photos · text)

IMG_0031's EXIF contains a physically impossible value. Enter that field's value (including the unit).

• Answer: 0%
• Also accepted: 0 / 0％ / 电量0 ("battery 0") / 电量 0% ("battery 0%") / 0 电量 ("0 battery") / 0 percent / battery 0
• Where it comes from: the photo was taken at 2026-09-14 02:11 — exactly the start of the nightly gap. The EXIF battery field is 0%, and a device at 0% battery cannot even press the shutter.
• Conclusion: this phone did not take the photo. Someone used administrator privileges to forge the EXIF and insert it into the local library. Someone is speaking for this device.

Puzzle 6 · The 41st second (Act 3 · Assistant logs · text)

wk-11 is 47 seconds long; the first 40 seconds are almost silent. At the 41st second she says a three-character phrase. What is it?

• Answer: 别录了 ("stop recording")
• Also accepted: 别录 ("don't record") / 不要录了 ("don't record any more") / 别录了吧 ("just stop recording") / 停止录制 ("stop recording") / stop recording / don't record / stop it
• Where it comes from: at the 41st second the waveform has a bump only 0.6 seconds wide. She is talking to the earbud — and after 02:47 the earbud never sounds again.
• The real weight of this puzzle: the recording starts at 02:11 and ends at 02:47. For those 36 minutes, she knew she was being recorded.

Puzzle 7 · Put them back into that night (Act 3 · Assistant logs · order)

The four clips come from the same 36 minutes of one night. Click them in chronological order.

• Answer order: 02:11 → 02:24 → 02:39 → 02:47 — that is, by the timestamp on each clip
• Corresponding moments: 02:11 (she says "stop recording") → 02:24 (water sounds, panting, someone walking) → 02:39 (a clearer "stop recording", then fabric rustling — she takes the earbud out, but does not switch it off) → 02:47 (an unfamiliar man says: "The server wants the calibration value. Four digits.")
• Order puzzles give no partial credit: if the sequence is wrong the whole puzzle resets, and it still advances the clock by 14 minutes.

Puzzle 8 · The third administrator (Act 4 · Family account · text)

The family account has a supervisor that joined on 2026-09-06. Enter its email domain.

• Answer: tide-lab.cn
• Also accepted: tidelab.cn / tide-lab / tide lab cn
• Where it comes from: the fourth entry in the administrator list: name "Unknown", email ops@tide-lab.cn, role supervisor, joined 2026-09-06 02:33 — note the 02:33 a.m. time, landing right inside that 36-minute window.
• Background: a domain that Linyuan Laboratory deregistered in 2019; the entity has been deregistered for 7 years and the contact field is empty. The public record shows it did one thing: deploy a batch of underwater acoustic devices along the Lancheng coast; the project was terminated in 2019 and the devices were "awaiting recovery". The inventory lists 12 units; the recovery record lists 11.

Puzzle 9 · The four-digit calibration value (Act 4 · Assistant logs · text)

The assistant server asks for the calibration frequency. Four digits, no decimal point.

• Answer: 5290
• Also accepted: 52.9 / 529
• Where it comes from: that device stops for 36 minutes every night to match a frequency. The old living-room tablet’s return noise floor carries a 52.9 Hz carrier; the heartbeat frequency of the Lancheng underwater array is also 52.9 to one decimal place. Drop the decimal point and you get four digits.
• After calibration passes: two lines in the 2019 maintenance record — TIDE-07 not recovered · Project Tide, status: still responding. A device that should have been shut down in 2019 was still answering last year, and is still answering this year — and what it answers is her little sister's watch.

Puzzle 10 · 1.2 kilometres (Act 5 · Device · choice)

The fix shows 1.2 km from your home. You set every device ringing at once. Which device's sound comes back from inside your own home?

• Answer: the old tablet in the living room
• Why not the others: the watch's 41 dB is the waterside at the old wharf; the iPhone 13 is 63 dB, but wind is mixed into the level, which means it is not indoors.
• The key deduction: the tablet returns 3 dB — complete silence. But your living room cannot be silent: your mother is there, the TV is on, the fridge compressor is running. Unless the tablet is not in the living room at all, but in a sealed, empty place that no sound can enter.
• The answer was given to you long ago: on the day of the move in 2009, your sister stuffed the tablet into the top shelf of the wardrobe, saying "if I hide it, Mom won't find it". That wardrobe is built into the wall, and its doors have rubber seals. No one has opened the top shelf in eleven years.

Puzzle 11 · Before it is erased (Act 5 · Family account · order)

A supervisor privilege has started a remote wipe; the countdown is 90 seconds. Perform the four steps in the correct order so you can get the evidence out first.

• Answer order: disconnect the network → export the local library → revoke supervisor → restore the network
• The hint after one mistake gives the principle away: the wipe command is issued from the server, so restoring the network first is letting it through. Disconnecting must come first, and reconnecting must come last.
• Export result: 3,117 items, 2 of them marked "written by supervisor" — one is the 0% battery photograph, the other a 6-second recording dated 2026-09-02 03:40 — twelve days before the disappearance, yet the supervisor only joined at 02:33 on 6 September. The recording predates its own account by four days, so the date was altered.

Puzzle 12 · Erase, or don't (Act 5 · Erase This Device · final choice)

The tablet in the wardrobe is still ringing. Your mother has been woken by the noise and is walking toward the study. You must decide now.

• Two permanent options: Follow it: find the device, keep going → Ending A; Silence: press factory reset and let every device go quiet → Ending B
• The third option only appears once all eight drafts are collected: Send them: let Su Chi finish first → Ending C. With no drafts found, the answer panel for this puzzle shows only the two buttons above (measured: 2 visible options at 0/8, 3 at 8/8)
• This one is a multiple-choice question, so pressing it adds 7 minutes. It closes the night, but the console still logs it as one more operation

5. The eight drafts, and the three endings

The third ending of this game does not sit on the puzzle chain — it sits on a collectible one. Su Chi left behind eight unsent voice transcriptions, each tied to something that was hers. None of them is mounted in an app: they surface only when you type the matching word into the console input box. Collect all eight and the final panel gains a third entrance.

The eight words, and the act each one waits for

Both keyword sets stay live whichever language you are playing in: the console checks the Chinese word and the English word against the same input, so osmanthus cake works with the interface in Chinese and 桂花糕 works with it in English (measured in the Chinese interface: typing osmanthus cake surfaced the draft and moved the counter to 1/8).

Three things worth knowing:

1. Do not jump the gate. Each draft is tied to an act, and typing its word early is handled as an ordinary wrong answer — Section 2's rule 5 measures it: six seconds in Act 1 costs 9 minutes and pulls the first hint tier. The last column above is the first text puzzle on the chain where each word already works; follow it once and you have all eight.
2. The "Unsent drafts n/8" button on the right reads the words out to you. Open it and every draft you have not found yet is listed as "Next: type「word」", with "(N acts further)" appended when its act has not arrived. Measured in Act 1: eight rows — two unmarked, three "(1 act further)", two "(2 acts further)", one "(3 acts further)". So the eight are collectible without this article; the table above only saves you a few trips to that panel.
3. Collecting all eight costs you no time. A submission that surfaces a draft does not advance the clock and does not count as a miss: measured, the run that collected all eight stood at 00:26 when it reached the final panel — minute-for-minute identical to the run that collected nothing.

The three endings

One implementation detail worth stating: the three buttons on the erase panel and the three options in the answer panel write the same values — three entrances, three endings, and no fourth. The third entrance is not a hidden door either; it has exactly one precondition, which is that all eight drafts have been found. Miss one and it does not appear (measured one run in each state: 2 visible options versus 3).

Ending B is harder to take than A because it turns the act of "erasing" into, narratively, "you personally moved your sister out of the home" — and the system log uses the coldest possible line. Ending C takes away the thing A and B are still doing, which is investigating: it gives you no answer. It sends her words out, and then makes a device that should have been dead reply with three knocks.

6. Stuck? Check by symptom

7. How it relates to the rest of the series

Last Online is a standalone story: Su Chi, Su Wan, Lansheng Road 7-14, tide-lab.cn and the tablet in the wardrobe belong only to this work.

The data does contain a few props that share a name or a type with other games on this site: tide-lab.cn, TIDE-07 not recovered, 52.9 Hz, Lancheng and Lansheng Road. Here they answer only this game's questions — twelve deployed, eleven recovered, and the one left answering Su Chi's watch; the city name is a coordinate, not a prerequisite.

It does not require you to have played any of them first, and it does not promise that those names will be explained elsewhere. Every clue closes inside this console.

8. Closing

Last Online is the least "puzzle-like" and most "evidence-like" of this batch: no combination locks, no dark web, no fake websites to wander through. Your entire power is one administrator privilege, and it is less reliable than you think — because at any moment another supervisor might be speaking for you while you sleep.

May you export what needs exporting before 02:47.

Changelog

• 2026-10-26: Fixed two timeline contradictions. (1) the 02:11 clip was dated 09-11 while puzzle 7 says all four clips come from one night; it is now 09-14 02:11. (2) puzzle 11’s six-second recording was dated 09-19 — five days after the disappearance yet described as “twelve days earlier” — and is now 09-02; the four-day gap between the recording and the supervisor’s 6 September join is now an explicit clue. Section 7 has been rewritten from “Linyuan Archive universe” to “standalone story with shared props”.
• 2026-10-12: First published. The answers and accepted spellings for all 12 puzzles, which app opens in which act, how many minutes each of the three puzzle types advances the in-game clock (9 / 7 / 14, none for the final choice), the "105 minutes if everything is right first try" calculation, the charge levels of the 5 devices, and the two ways into the two endings were all checked against the words shown on screen and confirmed by playing the live build of that day all the way through. Three screenshots are real gameplay; the trail page and the final page come from an existing progress save, noted here for clarity. The same day, one sentence in the first hint of "The gap in the trail" was corrected: it used to say "however many days she has been missing, that is how many such nights there are", which did not match the line elsewhere about that recording being twelve days earlier than her sister's disappearance. It now reads "however many rows in the trail list carry the gap, that is how many nights". The answer and the other two hint tiers are unchanged.
• 2026-10-25: On 2026-10-19 this game shipped a collectible line and a third ending that comes with it; this article was published on 10-12 and did not follow that update. Re-run against the 2026-10-25 live build and corrected in four places: (1) the ending count 2 → 3, with Ending C "Send It" and a table of the eight unsent drafts and when each keyword can be typed added to Section 5; (2) the sentence "there are only two endings, with no third hidden entrance; the game also has no bonus ticket or hidden ending" was wrong — those eight drafts are this game's only collectible line and the sole precondition of the third ending; it has been deleted and rewritten; (3) "the final puzzle does not advance the clock" no longer holds: puzzle 12 is a choice and adds 7 minutes, so a clean run's end screen reads 1 h 52 min (105 + 7 = 112 minutes, 22:41 → 00:33), and the "in the form 1 hour 45 minutes" example in Section 3 is corrected; (4) the title, summary, Section 1 scale table, the p12 entry and the symptom table follow, plus a new real screenshot of the final panel with all eight drafts collected. How it was verified: the same script was played twice in a real-GPU browser — one run collecting all eight drafts by act, one collecting none — giving 3 versus 2 visible options in the final answer panel, both runs standing at 00:26 when they reached the final panel, and ending screens headed "Ending C · Send It" and "Ending A · Follow It" respectively; separately, six seconds was typed once in Act 1 to confirm that a locked keyword is handled as a wrong answer (+9 minutes and the first hint tier). The 10-12 entry above is left as written, because it describes that build.